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Only an extremely crappily designed car would use less fuel at 75mph than it did at 50mph. Anyway, even if it somehow was labouring the engine so much at 50 that it was using more fuel, you could always change down a gear. By far the biggest drag force acting on a car above about 30mph is wind resistance, so the slower you go the less fuel you use. Gear ratios and the like are fairly trivial in the grand scheme of things.Originally Posted by chriswood_7
Anyway, my ER5 (like Agent's) averages between 59 and 65 mpg on my town commute. The 59mpg was when I let the tyres get a bit flat. I'm a bus driver and work shifts, so a lot of weeks my commute one way is medium to heavy traffic, the other way empty roads, balls-to-the-wall thrashing. The fuel consumption hardly varies however I ride though.
My mum's Clio 1.9 diesel (Mk1) seems to be doing about 40mpg on the same commute, although I haven't worked it out exactly. On booze cruises though it'll manage 55mpg+ cruising at 60-65mph, with four adults on board and 100kg or more of booze for the return journey. I reckon with two people on board and cruising at 55-60 I could get well over 65mpg out of it on a long trip.
As a side note, most car/bike speedos over read- often by up to 10%- in fact I once heard that it was actually a European legal requirement for them to do so. If the odometer over-reads by a similar amount, then you're not quite getting the mileage you think you are.
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Though it can be reasonably economical if you shift at 2500rpm and keep off turbo - but frankly its impossible to drive like that for more than a couple of miles 
the sound of those 6 pistons pummeling past 8000rpm with the 2 turbos whistling and the HKS filters sucking big gobs of air is intoxicating and addictive!
SCAN.care@HEXUS
